Iola 1 W Threshold Days by Year (USC00143984)

19 fixed thresholds counted per year at Iola 1 W (USC00143984): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iola 1 W Thresholds

Iola 1 W: days with 10 mm (0.39 in) or more of precipitation in 120 years, most in 1987 with 46.
Iola 1 W: days with 25 mm (0.98 in) or more of precipitation in 120 years, most in 1927 with 21.
Iola 1 W: days with 50 mm (1.97 in) or more of precipitation in 112 years, most in 1973 with 10.
Iola 1 W: nights with a minimum temperature at or below 0 C (32 F) in 68 years, most in 2018 with 123.
19 fixed thresholds have at least one qualifying day at Iola 1 W.

Days at or above 30 C (86 F)

67 years with a qualifying day

Days per year at Iola 1 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 120 in 1980.

Days at or above 30 C (86 F) per year at Iola 1 W
Year	Days	Decade average
1959	88	88
1960	79	80.6
1961	62	80.6
1962	90	80.6
1963	119	80.6
1964	88	80.6
1965	83	80.6
1966	75	80.6
1967	64	80.6
1968	73	80.6
1969	73	80.6
1970	83	82.8
1971	78	82.8
1972	85	82.8
1973	74	82.8
1974	65	82.8
1975	89	82.8
1976	77	82.8
1977	86	82.8
1978	106	82.8
1979	85	82.8
1980	120	89.6
1981	90	89.6
1983	92	89.6
1984	93	89.6
1985	84	89.6
1986	84	89.6
1987	80	89.6
1988	97	89.6
1989	66	89.6
1990	86	72.6
1991	96	72.6
1992	46	72.6
1993	68	72.6
1994	82	72.6
1995	77	72.6
1996	74	72.6
1997	53	72.6
1998	85	72.6
1999	59	72.6
2000	74	64.1
2001	73	64.1
2002	86	64.1
2003	62	64.1
2004	32	64.1
2005	83	64.1
2006	79	64.1
2007	65	64.1
2008	39	64.1
2009	48	64.1
2010	78	74.7
2011	87	74.7
2012	91	74.7
2013	72	74.7
2014	60	74.7
2015	59	74.7
2016	78	74.7
2017	63	74.7
2018	87	74.7
2019	72	74.7
2020	81	76.3
2021	77	76.3
2022	91	76.3
2023	85	76.3
2024	66	76.3
2025	55	76.3
2026	79	76.3

For each year, a bar from the first to the last day at Iola 1 W meeting 30 C (86 F).

First to last qualifying date each year at Iola 1 W
Year	First date	Last date
1959	1959-04-30	1959-09-27
1960	1960-05-22	1960-10-11
1961	1961-04-24	1961-09-11
1962	1962-04-29	1962-10-13
1963	1963-04-20	1963-10-19
1964	1964-05-04	1964-09-19
1965	1965-04-21	1965-10-10
1966	1966-03-31	1966-09-24
1967	1967-03-11	1967-10-04
1968	1968-05-01	1968-09-22
1969	1969-05-28	1969-10-04
1970	1970-04-28	1970-09-20
1971	1971-05-31	1971-09-29
1972	1972-04-11	1972-09-20
1973	1973-05-19	1973-09-21
1974	1974-05-13	1974-09-11
1975	1975-05-18	1975-10-21
1976	1976-04-07	1976-10-04
1977	1977-04-07	1977-09-30
1978	1978-05-23	1978-10-21
1979	1979-06-04	1979-10-20
1980	1980-04-21	1980-10-10
1981	1981-04-12	1981-10-05
1983	1983-05-27	1983-10-02
1984	1984-05-13	1984-09-25
1985	1985-04-18	1985-09-19
1986	1986-04-25	1986-09-28
1987	1987-04-18	1987-09-15
1988	1988-05-11	1988-10-17
1989	1989-04-21	1989-10-14
1990	1990-05-25	1990-09-28
1991	1991-05-13	1991-10-23
1992	1992-06-15	1992-10-13
1993	1993-06-13	1993-09-23
1994	1994-05-25	1994-10-01
1995	1995-03-22	1995-10-17
1996	1996-04-11	1996-09-12
1997	1997-05-17	1997-10-03
1998	1998-05-16	1998-09-29
1999	1999-06-04	1999-09-07
2000	2000-05-08	2000-10-03
2001	2001-05-15	2001-09-07
2002	2002-04-17	2002-10-01
2003	2003-05-10	2003-10-21
2004	2004-05-21	2004-09-20
2005	2005-05-12	2005-10-19
2006	2006-04-14	2006-10-04
2007	2007-06-08	2007-10-07
2008	2008-05-20	2008-09-03
2009	2009-05-30	2009-09-28
2010	2010-05-25	2010-10-09
2011	2011-04-04	2011-09-29
2012	2012-04-02	2012-09-26
2013	2013-05-15	2013-10-05
2014	2014-05-04	2014-10-26
2015	2015-04-08	2015-10-09
2016	2016-04-11	2016-10-18
2017	2017-03-20	2017-10-15
2018	2018-05-07	2018-10-06
2019	2019-04-11	2019-10-03
2020	2020-04-09	2020-10-15
2021	2021-06-05	2021-10-10
2022	2022-05-10	2022-09-28
2023	2023-05-07	2023-10-03
2024	2024-04-15	2024-10-25
2025	2025-06-09	2025-09-17
2026	2026-03-21	2026-10-14

Every Fixed Threshold

Fixed thresholds at Iola 1 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	67	120	1980	79
35 C (95 F): Days	65	68	1980	19
40 C (104 F): Days	13	21	1980	1
90 F (32.2 C): Days	67	102	1980	45
100 F (37.8 C): Days	34	31	1980	2
0 C (32 F): Ice days (max	67	40	1978	11
0 C (32 F): Frost days (min	68	123	2018	55
-10 C (14 F): Days with min	68	41	1978	12
-20 C (-4 F): Days with min	36	10	1979	1
-30 C (-22 F): Days with min	1	1	2011	1
20 C (68 F): Tropical nights (min	68	85	1980	63
25 C (77 F): Days with min	48	23	1980	7
10 mm (0.39 in): Days with 10 mm or more rain	120	46	1987	23
25 mm (0.98 in): Days with 25 mm or more rain	120	21	1927	11
50 mm (1.97 in): Days with 50 mm or more rain	112	10	1973	4
100 mm (3.94 in): Days with 100 mm or more rain	27	2	1916	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2021	1
10 cm (3.9 in): Days with 10 cm or more snowfall	26	3	1985	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1938	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

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Data for Iola 1 W threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Iola 1 W Threshold Days by Year (USC00143984)

Key Facts for Iola 1 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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